Canon EOS Rebel XT - Manual (Page 70)

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The AF mode is the autofocusing operation method. Three AF modes
are provided. One-Shot AF is suited for still subjects, while AI Servo AF
is for moving subjects. And AI Focus AF switches from One-Shot AF to
AI Servo AF automatically if the still subject starts moving. In the Basic
Zone modes, the optimum AF mode is set automatically.
1 Set the lens focus mode switch to
<AF>.
(p.25)
2 Press the <
Z Z Z ZE> button.
s The [AF mode] menu will appear.
3 Select the AF mode.
¡ Press the <
V> key to select the
desired setting, then press <
0>.
X: One-Shot AF
9 : AI Focus AF
Z : AI Servo AF
¡ When you press the shutter button
halfway, the LCD panel will display an
arrow <
D> next to the current AF
mode.
f Selecting the AF ModeN
¡ Although you can still set the AF mode while the lens focus mode switch
is set to <MF>, the AF mode will not take effect during manual focus.
¡ If an Extender (optional) is attached and the maximum aperture of the
lens is f/5.6 or smaller, AF will not be possible. For details, see the
Extender’s instructions.
<AF> stands for Auto Focus, and <MF> is Manual Focus.